The Johnny Stewart Estrus Whimper Predator Call is extremely effective at triggering instinctive reactions during the mating season. It produces yips, barks, howls and whimpers that appeal to a coyote's mating and territorial instincts. Simply depress the lever and blow through the Mac Daddy mouthpiece to produce authentic breeding vocalizations. Made with moisture-resistant Infinity Latex, it blows easier and lasts longer. The Estrus Whimper includes an instructional DVD. A Replacement Reed Kit is available separately. Johnny Stewart pioneered the most powerful weapon in the war on predators more than 50 years ago. Today, the world's most lethal predator hunters rely on the true wildlife sounds captured by Stewart and his son Gerald over the years- sounds that have led to the demise of countless coyotes, foxes, bobcats, wolves and other varmints since the early 1960s.